Democrats hold overwhelming voter registration advantages in those three districts.

Republican state Sen. Scott Hammond and Democratic challenger Alexander Marks also get a free pass to the general election ballot in GOP-leaning District 18.

Pete Goicoechea, a Eureka Republican whose sprawling District 19 includes a sliver of rural Clark County, skates in June to face Independent American candidate Janine Hansen in the fall. Other Senate challengers who will skip the primary are Carrie Buck, a Republican, in District 5; and Nicole Cannizzaro, a Democrat, in District 6.

In the Assembly, 16 Clark County Democratic candidates, including nine incumbents, face no primary opposition and will head straight to the general election.